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Study: Ultra-processed foods linked to cancer

Health & Science
 Isaac Njiru the proprietor Erangi Hills Food Processors Limited showing the different processed food products at his shop. [Photo by Joseph Muchiri/Standard]

Scientists have suggested a link between cancer and 'ultra-processed' foods such as cookies, fizzy drinks, and sugary cereals.

However, outside experts have cautioned against reading too much into the study results.

Researchers from France and Brazil used data from nearly 105,000 French adults who completed online questionnaires detailing their intake of 3,300 different food items. This was compared to cases of diagnosed cancer among the group.

"The results show that a 10 per cent increase in the proportion of ultra-processed foods in the diet was associated with increases of 12 per cent in the risk of overall cancer and 11 per cent in the risk of breast cancer," said a press statement from The BMJ, which published the research. No significant association was found for prostate or colorectal cancer.

Foods on the list included packaged breads, buns, pizzas and cakes, crisps, industrially-produced desserts, sodas, fish and chicken nuggets, instant noodles and soups, and frozen ready meals. Previous research had linked processed foods high in sugar, fat, and salt to obesity, high blood pressure, and high cholesterol, but firm evidence for increased disease risk has been 'scarce', the team said.

They stressed their research showed no more than a correlation between a diet high in ultra-processed foods and cancer.

This could be coincidental and does not prove conclusively that these types of food actively cause cancer.

Ian Johnson, a nutrition researcher from the Quadram Institute Bioscience in England, said the authors identified "some rather weak associations, of low statistical significance."

"The problem is that the definition of ultra-processed foods they have used is so broad and poorly defined that it is impossible to decide exactly what, if any, causal connections have been observed," he said in comments via the Science Media Centre.

Tom Sanders of the King's College London agreed that the term 'ultra-processed food" was 'difficult to define'.

"The definition excludes many home-made or artisanal foods," he said.

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